Booster car seat base



FIG. 1 is a perspective view of the booster car seat base showing the design of my invention;

FIG. 2 is a right side view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a top view thereof.

The left side view is a mirror image of the right side view.

The bottom of booster car seat base is plain and unadorned. 

The ornamental design of the booster car seat base, as shown and described. 